Gonotec Gmbh, Germany

OSMOMAT 090 MEMBRANE OSMOMETER

OSMOMAT 090 MEMBRANE OSMOMETER for the determination of molecular weights in the range 5,000 to 20,00,000 Daltons in organic solvents at an operational temperature of 30°C to 130°C for various organic solvents or water.

DESCRIPTION

OSMOMAT 090 MEMBRANE OSMOMETER for the determination of molecular weights in the range 5,000 to 20,00,000 Daltons in organic solvents at an operational temperature of 30°C to 130°C for various organic solvents or water.

MEASUREMENT PRINCIPLE

A membrane osmometer consists of an osmotic cell which is located in a cell thermostat. The osmotic cell is divided into two sections by a semipermeable membrane.

In the lower section, a hermetically sealed cell which is filled with pure solvent, a precision pressure measuring system is installed. The upper section, which is positioned above the semipermeable membrane, is designed as a meander-shaped channel system with a large surface. A funnel tube and a discharge valve enable rinsing and filling of the cell with solvent or polymer solution.

Due to the osmotic pressure difference between solvent and solution, a vacuum, which is related to the concentration of the osmotically active solute particles, is generated in the lower half of the cell.

MAJOR MERITS

1. High performance measuring cell

2. Small sample volume requirement

3. System avoids balloon effects for precise measurements

4. Allows usage of various solvents, water aqueous and electrolyte solvents

5. Short response time

6. Highest measuring resolution of 0.1mm of liquid column per digit

6. Permits usage of membrane diameter of 40mm offering greater convenience

6. Shares semi automated control unit SA, with 090, with companion unit Osmomat 070 vapour pressure osmometer saving significant cost

SMALLEST DETECTABLE PRESSURE

0.1 mm solvent column

MOLECULAR WEIGHT RANGE

5,000 to 20,00,000 Dalton, lower range depending on the semi-permeable membrane

MEASUREMENT CELL VOLUME

Approximately 0.5 mL

MEMBRANE DIAMETER

40 mm

SAMPLE VOLUME OF POLYMER SOLUTION

Minimum three solutions of two mL each with
stepped concentration in the range of 1 to 5%

 APPLICATIONS

Average molecular weight determination in toluene, water solvents

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